En passant is the most unusual pawn capture in orthodox chess.
It exists only in a very specific situation:
- an opposing pawn has just advanced two squares in one move from its original square;
- your pawn stands on the same rank on an adjacent file;
- your pawn could have captured that pawn if the opponent had advanced only one square.
In that one immediate reply window, your pawn may capture as though the opposing pawn had moved only one square.
The capturing pawn does not move to the opponent pawn's landing square.
Instead:
- it moves diagonally to the square the opposing pawn passed over;
- the opposing pawn is removed from the square where it actually landed.
That combination makes en passant unlike any ordinary capture.
Why en passant exists
The rule is mechanically tied to the pawn's initial two-square move.
Imagine a pawn that could normally be captured if it advanced only one square.
If the two-square first move allowed that pawn to leap past the opposing pawn's capture relationship with no special response, the double advance would bypass a capture that would have existed after a one-square advance.
En passant preserves a one-move opportunity for the adjacent opposing pawn to make that capture.
The exact trigger
An en-passant capture can arise only when all of the trigger conditions are present.
Condition 1 — the opponent just moved a pawn
The move immediately before the possible en-passant capture must have been made by an opposing pawn.
Not:
- a rook;
- bishop;
- knight;
- queen;
- king.
Condition 2 — that pawn advanced two squares in one move
The pawn must have used its initial two-square option.
Examples:
White:
- from second rank to fourth rank.
Black:
- from seventh rank to fifth rank.
If the pawn moved only one square:
- no en-passant right is created.
Condition 3 — the pawn moved from its original square
The double advance must be the pawn's legal first-move two-square advance.
A pawn cannot later move two squares from another rank.
Therefore an en-passant trigger always comes from the ordinary initial double-step rule.
Condition 4 — the capturing pawn is adjacent on the same rank
After the opponent's double advance, the potential capturing pawn must stand:
- on the same rank as the opponent pawn;
- on an adjacent file.
For a White capturing pawn, this typically means the White pawn is on its fifth rank.
For a Black capturing pawn, this typically means the Black pawn is on its fourth rank.
The rule is relational, not based on visual distance alone
It is not enough that:
- two pawns happen to stand next to each other.
The opponent pawn must have just arrived there by a legal two-square move from its original square.
Two adjacent pawns that reached the same arrangement through different move histories may have no en-passant right.
En passant depends on the previous move, not just the current piece placement.
This makes en passant, like castling rights, part of the hidden historical state of a position.
Executing en passant
The move is executed as though the opposing pawn had advanced only one square.
Example:
White pawn:
- e5.
Black pawn has just moved:
- d7 → d5.
White may play en passant:
- White pawn e5 → d6;
- Black pawn on d5 is removed.
The capturing pawn finishes on d6.
It does not finish on d5.
Stage 1
White pawn e5. Black pawn d7.
Stage 2
Black plays d7-d5.
Show:
- d6 as passed-over square.
Stage 3
White plays exd6 en passant.
Result:
- White pawn d6;
- Black pawn d5 removed.
Purpose: Make the non-ordinary destination/removal geometry explicit.
Destination = passed-over square. Captured pawn = removed from its landing square.
Why this differs from an ordinary capture
In an ordinary capture:
- the capturing chessman moves onto the square occupied by the captured chessman.
In en passant:
- the capturing pawn moves to a different square;
- the captured pawn is removed from its adjacent landing square.
| Capture type | Capturing piece finishes on | Captured piece removed from |
|---|---|---|
| Ordinary pawn capture | Enemy-occupied diagonal square | Same square |
| En passant | Passed-over diagonal square | Opponent pawn's landing square |
Only a pawn can capture en passant
En passant is specifically a pawn rule.
A:
- bishop;
- rook;
- knight;
- queen;
- king
cannot make an en-passant capture.
En passant is still one move
The operation:
- move capturing pawn;
- remove opponent pawn;
is one legal chess move.
It is not two moves or a special action between turns.
The immediate-move requirement
The en-passant opportunity exists only on the move immediately following the opponent's two-square pawn advance.
If the capturing side chooses another legal move first:
- the en-passant opportunity disappears.
It does not remain available later.
En passant is now or never.
Example timeline
Position:
- White pawn e5;
- Black pawn d7.
Black: ...d7-d5
White now has the en-passant option: exd6 e.p.
But suppose White instead plays: Kh2
Black makes another move.
White can no longer later play: exd6 e.p.
The opportunity expired when White chose a different reply.
"The pawns are still next to each other, so I can capture en passant later."
No.
Adjacency does not preserve the right.
The en-passant capture is legal only on the immediately following move.
Why side to move matters
After the triggering double advance:
- only the opposing side now has the en-passant opportunity;
- that opportunity belongs to the current move only.
This is another reason that legal position state includes more than piece placement.
Cases that do not create en passant
Pawn moved only one square
Example:
Black pawn:
- d6 → d5.
White pawn:
- e5.
The Black pawn arrived adjacent, but it did not just advance two squares from its original square.
No en passant.
Double move happened earlier
Example:
Black:
- d7-d5.
White:
- makes another move instead.
Black:
- makes another move.
White:
- attempts exd6 e.p.
Illegal.
The window has expired.
Pawns are not adjacent
Example:
White pawn:
- e5.
Black:
- c7-c5.
After the move:
- Black pawn c5;
- White pawn e5.
One file lies between them.
No en passant.
Wrong rank relationship
Two pawns may be on adjacent files but not in the rank relationship required for the passed-over square capture.
Example:
- White pawn e4;
- Black plays d7-d5.
The White pawn on e4 is not on the same rank as the Black pawn on d5 after the move.
It does not receive an en-passant capture.
The moving chessman was not a pawn
No en-passant rule is triggered by:
- rook move;
- knight move;
- bishop move;
- queen move;
- king move.
En passant and king safety
En passant must satisfy the same complete legality rule as every other move:
the moving side's king must be safe in the resulting position.
This creates an important edge case because en passant changes three squares at once:
- the capturing pawn leaves its original square;
- the capturing pawn arrives on the passed-over square;
- the captured pawn disappears from its landing square.
That can open a:
- rank;
- file;
- diagonal.
If the resulting line attacks the moving side's king:
the en-passant capture is illegal.
A valid en-passant trigger does not guarantee a legal en-passant move.
King safety still decides final legality.
Classic rank-opening structure
A useful teaching structure places:
- White king on a5;
- White pawn on b5;
- Black pawn on c7;
- Black rook on h5;
- clear fifth rank between c5 and h5 as appropriate.
Black plays: c7-c5
The White pawn appears able to capture: bxc6 e.p.
But after en passant:
- White pawn leaves b5;
- Black pawn disappears from c5;
- the fifth rank may open between the Black rook and White king.
If the resulting position leaves the White king in rook check:
bxc6 e.p. is illegal.
En passant can also remove a check
Because the move changes several squares, en passant can in rare legal positions:
- capture a checking pawn;
- block or alter a line;
- otherwise leave the king safe.
If the move satisfies all rules and removes every current check, it can be a legal response.
You do not need to memorize every possible edge-case diagram. The governing principle is enough:
evaluate the complete resulting position.
En passant can give check
After en passant:
- the capturing pawn may itself attack the opposing king;
- removal of the captured pawn may open a rook/bishop/queen line.
Therefore the move can produce check.
Again, this is not a separate special rule.
It follows from:
- execute the legal move;
- recalculate the resulting attack map.
En passant and repetition identity — preview
Because en-passant availability exists for only one immediate move, two boards can have identical piece placement but still be different positions for repetition purposes.
Under the FIDE repetition rule, positions are not considered the same in the relevant sense if, at the start of the sequence, a pawn could have been captured en passant and that possibility later no longer exists.
That means en-passant availability is part of legal position identity.
Same pieces on same squares does not always mean same legal position.
Castling rights already demonstrated this.
En-passant availability demonstrates it again.
Notation preview
En-passant captures are normally written in standard algebraic notation as ordinary pawn captures to the destination square.
For example:
exd6
An explanatory e.p. suffix may sometimes be shown in instructional material, but it is not necessary to make the move legal.
Full move notation is covered separately; this guide only needs enough notation to recognize the move.
En passant legality workflow
When you think en passant may be available, use this sequence.
1. What was the immediately previous move?
Was it:
- an opposing pawn;
- moving two squares;
- from its original square?
If no:
- no en passant.
2. Is your pawn adjacent on the same rank?
After the double move:
- same rank;
- adjacent file?
If no:
- no en passant.
3. What square did the pawn pass over?
That is the capturing pawn's destination square.
4. Remove the correct pawn
Captured pawn is removed from:
- its two-square landing square.
Do not leave it on the board.
5. Is this the immediate reply?
If another move has already occurred:
- right expired.
6. Recalculate king safety
After:
- moving your pawn;
- removing the enemy pawn;
is your own king attacked?
If yes:
- en passant illegal.
If no:
- the move can be legal, assuming all other requirements are satisfied.
En passant practice
Case 1 — Valid White en passant
White:
- pawn e5.
Black:
- pawn d7 → d5 as previous move.
White to move.
Question: Can White play en passant?
Answer: Yes, if the resulting position leaves White's king safe.
Move:
- e5 → d6;
- remove Black pawn d5.
Case 2 — Valid Black en passant
Black:
- pawn c4.
White:
- pawn b2 → b4 as previous move.
Black to move.
Question: Can Black capture en passant?
Answer: Yes, if king safety permits.
Move:
- c4 → b3;
- remove White pawn b4.
Case 3 — Pawn moved one square only
White pawn:
- e5.
Black previous move:
- d6 → d5.
Question: En passant?
Answer: No.
Reason: opponent pawn did not just make a two-square move from its original square.
Case 4 — Delayed attempt
Black:
- d7-d5.
White:
- plays another move.
Black:
- replies.
White now tries:
- exd6 e.p.
Answer: Illegal.
Reason: the immediate-reply window expired.
Case 5 — Non-adjacent pawn
White:
- e5.
Black previous move:
- c7-c5.
Answer: No en passant.
Reason: pawns are not on adjacent files after the move.
Case 6 — Wrong rank
White:
- e4.
Black previous move:
- d7-d5.
Answer: No en passant.
Reason: the White pawn is not on the same rank as the Black pawn after the double advance.
Case 7 — King-safety illegality
Use a legality-checked position where:
- trigger conditions are satisfied;
- en-passant removal opens a rook/bishop/queen line onto the capturing side's king.
Answer: En passant is illegal.
Reason: the resulting position leaves own king in check.
Case 8 — Ordinary capture vs en passant
Compare:
A. Ordinary capture
White pawn on e5, Black piece on d6. White can capture exd6, removing the piece from the destination square.
B. En passant
White pawn on e5, and Black has just played d7-d5. White can play exd6 e.p.: the white pawn lands on d6 while the black pawn is removed from d5.
The critical difference is that an ordinary capture removes a piece from the destination square, while en passant removes the qualifying pawn from the square beside the capturing pawn.
Common en-passant mistakes
"Any adjacent pawn can be captured en passant."
Wrong.
The adjacent pawn must have just advanced two squares from its original square.
"I capture onto the pawn's square."
Wrong.
The capturing pawn moves onto the passed-over square.
The opponent pawn is removed from its landing square.
"I can do it on a later move."
Wrong.
The opportunity exists only on the immediately following move.
"If the trigger is correct, the move is automatically legal."
Wrong.
Own-king safety still applies.
"En passant is a free extra action."
Wrong.
It is one move made instead of another move on that turn.
En passant as invisible position state
Like castling, en passant shows that a chess position cannot always be reconstructed from board occupancy alone.
Imagine two diagrams with identical chessmen:
- White pawn e5;
- Black pawn d5;
- same kings and all other pieces.
Position A:
- Black's immediately previous move was d7-d5.
Position B:
- Black pawn had already been on d5 for several moves.
Board appearance: identical.
Legal options: different.
In Position A:
exd6 e.p.may be available.
In Position B:
- it is not.
Move history can change legal moves without changing the visible board.
This matters for:
- FEN;
- repetition;
- engine/game-state representation.
En passant rules at a glance
En passant requires all of the following:
- Opponent's previous move was a pawn double advance from its original square.
- Your pawn stands on the same rank and an adjacent file.
- You take the opportunity immediately.
- Your pawn moves diagonally to the square the opponent pawn passed over.
- The opponent pawn is removed from its landing square.
- The resulting position leaves your own king safe.
Trigger → immediate window → passed-over destination → off-destination removal → king-safety test.
En passant is unusual because:
- its legality depends on the immediately previous move;
- the capturing pawn does not land on the captured pawn's square;
- removing the captured pawn can alter distant lines.
The other major special pawn rule appears at the opposite end of the board: promotion.